Proceedings of the 21st International Conference on Electronic Publishing. Twenty-one years ago, the term electronic publishing promised all manner of potential that the Web and network technologies could bring to scholarly communication, scientific research and technical innovation. Over the last two decades, tremendous developments have indeed taken place across all of these domains. One of the most important of these has been Open Science perhaps the most widely discussed topic in research communications today.This book presents the proceedings of Elpub 2017, the 21st edition of the International Conference on Electronic